/* ==========================================================================
   영어회화365 Design System & Modern Styling
   ========================================================================== */

:root {
  /* Color Palette */
  --bg-main: #0B0F19;
  --bg-surface: #111827;
  --bg-card: rgba(17, 24, 39, 0.85);
  --bg-card-hover: rgba(31, 41, 55, 0.9);
  --border-subtle: rgba(255, 255, 255, 0.08);
  --border-focus: #6366F1;
  
  --primary: #4F46E5;
  --primary-light: #6366F1;
  --primary-hover: #4338CA;
  --accent-cyan: #06B6D4;
  --accent-emerald: #10B981;
  --accent-amber: #F59E0B;
  --accent-rose: #F43F5E;
  
  --text-main: #F9FAFB;
  --text-muted: #9CA3AF;
  --text-dim: #6B7280;
  
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-full: 9999px;
  
  --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.4);
  --shadow-glow: 0 0 24px rgba(79, 70, 229, 0.35);
  --shadow-cyan-glow: 0 0 20px rgba(6, 182, 212, 0.3);
  
  --font-family: 'Pretendard', 'Outfit', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --bottom-nav-height: 72px;
}

/* Reset & Global */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  -webkit-tap-highlight-color: transparent;
}

body {
  font-family: var(--font-family);
  background-color: var(--bg-main);
  color: var(--text-main);
  line-height: 1.5;
  min-height: 100vh;
  display: flex;
  justify-content: center;
  overflow-x: hidden;
}

.app-container {
  width: 100%;
  max-width: 680px; /* Optimal mobile/tablet portrait width */
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  background: radial-gradient(circle at 50% 0%, rgba(79, 70, 229, 0.12) 0%, transparent 60%),
              radial-gradient(circle at 100% 100%, rgba(6, 182, 212, 0.08) 0%, transparent 50%),
              var(--bg-main);
  padding-bottom: calc(var(--bottom-nav-height) + 24px);
  position: relative;
}

/* Header */
.app-header {
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  background: rgba(11, 15, 25, 0.85);
  border-bottom: 1px solid var(--border-subtle);
  padding: 12px 18px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.header-left {
  display: flex;
  align-items: center;
  gap: 12px;
}

.logo-badge {
  display: flex;
  align-items: center;
  gap: 8px;
}

.logo-icon {
  font-size: 1.3rem;
  filter: drop-shadow(0 0 8px rgba(79, 70, 229, 0.6));
}

.logo-title {
  font-size: 1.15rem;
  font-weight: 700;
  letter-spacing: -0.5px;
  background: linear-gradient(135deg, #FFFFFF 0%, #A5B4FC 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.header-lesson-info {
  display: flex;
  align-items: center;
  gap: 6px;
}

.badge-tag {
  background: rgba(79, 70, 229, 0.25);
  border: 1px solid rgba(99, 102, 241, 0.4);
  color: #A5B4FC;
  font-size: 0.75rem;
  font-weight: 600;
  padding: 2px 8px;
  border-radius: var(--radius-full);
}

.step-tag {
  background: rgba(255, 255, 255, 0.08);
  font-size: 0.75rem;
  color: var(--text-muted);
  padding: 2px 8px;
  border-radius: var(--radius-full);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 8px;
}

.header-btn {
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid var(--border-subtle);
  color: var(--text-main);
  padding: 6px 10px;
  border-radius: var(--radius-md);
  font-size: 0.8rem;
  display: flex;
  align-items: center;
  gap: 5px;
  cursor: pointer;
  transition: all 0.2s ease;
}

.header-btn:hover {
  background: rgba(255, 255, 255, 0.12);
  border-color: var(--border-focus);
}

.header-btn.active {
  background: rgba(99, 102, 241, 0.3);
  border-color: var(--primary-light);
  color: #E0E7FF;
}

/* Global Progress Bar */
.progress-bar-container {
  padding: 8px 18px 4px 18px;
  background: rgba(17, 24, 39, 0.5);
  border-bottom: 1px solid var(--border-subtle);
}

.progress-track {
  width: 100%;
  height: 6px;
  background: rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-full);
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--primary) 0%, var(--accent-cyan) 100%);
  border-radius: var(--radius-full);
  transition: width 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.step-indicator-pills {
  display: flex;
  justify-content: space-between;
  margin-top: 6px;
  overflow-x: auto;
  gap: 4px;
  scrollbar-width: none;
}

.step-indicator-pills::-webkit-scrollbar {
  display: none;
}

.step-pill {
  font-size: 0.65rem;
  color: var(--text-dim);
  white-space: nowrap;
  padding: 2px 4px;
}

.step-pill.active {
  color: var(--accent-cyan);
  font-weight: 700;
}

.step-pill.completed {
  color: var(--accent-emerald);
}

/* Tabs */
.main-content {
  flex: 1;
  padding: 16px 18px;
}

.tab-pane {
  display: none;
  animation: fadeIn 0.3s ease;
}

.tab-pane.active {
  display: block;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(6px); }
  to { opacity: 1; transform: translateY(0); }
}

.hidden {
  display: none !important;
}

/* Hero Card */
.hero-card {
  background: linear-gradient(135deg, rgba(30, 27, 75, 0.8) 0%, rgba(17, 24, 39, 0.95) 100%);
  border: 1px solid rgba(99, 102, 241, 0.25);
  box-shadow: var(--shadow-glow);
  border-radius: var(--radius-lg);
  padding: 24px;
  margin-bottom: 24px;
  position: relative;
  overflow: hidden;
}

.hero-card::after {
  content: "";
  position: absolute;
  top: -30px;
  right: -30px;
  width: 140px;
  height: 140px;
  background: radial-gradient(circle, rgba(99, 102, 241, 0.25) 0%, transparent 70%);
  border-radius: 50%;
  pointer-events: none;
}

.greeting-subtitle {
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.8px;
  color: var(--accent-cyan);
  display: block;
  margin-bottom: 8px;
}

.hero-title {
  font-size: 1.55rem;
  font-weight: 800;
  line-height: 1.3;
  margin-bottom: 8px;
}

.highlight-gradient {
  background: linear-gradient(90deg, #38BDF8 0%, #818CF8 50%, #C084FC 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-desc {
  font-size: 0.9rem;
  color: var(--text-muted);
  margin-bottom: 20px;
  line-height: 1.5;
}

.btn-primary-large {
  width: 100%;
  background: linear-gradient(135deg, #4F46E5 0%, #3B82F6 100%);
  border: none;
  color: #FFFFFF;
  padding: 14px 20px;
  border-radius: var(--radius-md);
  font-size: 1rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 14px;
  transition: all 0.25s ease;
  box-shadow: 0 4px 14px rgba(79, 70, 229, 0.4);
}

.btn-primary-large:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(79, 70, 229, 0.55);
}

.pulse-glow {
  animation: pulseButton 2.5s infinite;
}

@keyframes pulseButton {
  0% { box-shadow: 0 0 0 0 rgba(79, 70, 229, 0.6); }
  70% { box-shadow: 0 0 0 12px rgba(79, 70, 229, 0); }
  100% { box-shadow: 0 0 0 0 rgba(79, 70, 229, 0); }
}

.btn-primary-large .btn-icon {
  font-size: 1.4rem;
}

.btn-primary-large .btn-text {
  display: flex;
  flex-direction: column;
  text-align: left;
}

.btn-primary-large .btn-text strong {
  font-size: 1rem;
}

.btn-primary-large .btn-text small {
  font-size: 0.75rem;
  opacity: 0.85;
}

/* Sections */
.section-container {
  margin-bottom: 28px;
}

.section-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  margin-bottom: 14px;
}

.section-title {
  font-size: 1.2rem;
  font-weight: 700;
  letter-spacing: -0.3px;
}

.section-subtitle {
  font-size: 0.8rem;
  color: var(--text-dim);
  margin-top: 2px;
}

.badge-accent {
  background: rgba(16, 185, 129, 0.15);
  border: 1px solid rgba(16, 185, 129, 0.3);
  color: #34D399;
  font-size: 0.75rem;
  font-weight: 600;
  padding: 4px 10px;
  border-radius: var(--radius-full);
}

/* Curriculum Grid */
.lesson-grid {
  display: grid;
  gap: 12px;
}

.lesson-card-item {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
  transition: all 0.2s ease;
  position: relative;
  overflow: hidden;
}

.lesson-card-item:hover {
  background: var(--bg-card-hover);
  border-color: rgba(99, 102, 241, 0.4);
  transform: translateY(-2px);
}

.lesson-card-item.active-today {
  border-color: var(--primary-light);
  box-shadow: 0 0 16px rgba(99, 102, 241, 0.2);
}

.lesson-card-item.completed {
  border-color: rgba(16, 185, 129, 0.35);
}

.lesson-card-left {
  display: flex;
  align-items: center;
  gap: 14px;
}

.day-circle {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.85rem;
  color: var(--text-main);
  flex-shrink: 0;
}

.lesson-card-item.completed .day-circle {
  background: rgba(16, 185, 129, 0.2);
  border-color: var(--accent-emerald);
  color: #6EE7B7;
}

.lesson-card-info h3 {
  font-size: 0.95rem;
  font-weight: 600;
  margin-bottom: 2px;
}

.lesson-card-info p {
  font-size: 0.8rem;
  color: var(--text-muted);
}

.lesson-card-right {
  display: flex;
  align-items: center;
  gap: 8px;
}

.progress-pill-tag {
  font-size: 0.7rem;
  padding: 2px 8px;
  border-radius: var(--radius-full);
  background: rgba(255, 255, 255, 0.06);
  color: var(--text-muted);
}

.lesson-card-item.completed .progress-pill-tag {
  background: rgba(16, 185, 129, 0.2);
  color: #6EE7B7;
}

.arrow-icon {
  color: var(--text-dim);
  font-size: 0.9rem;
}

/* ==========================================================================
   Lesson Runner (8-Step Engine)
   ========================================================================== */

.lesson-runner-container {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.step-header-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 14px 18px;
}

.step-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 6px;
}

.badge-step-type {
  background: rgba(79, 70, 229, 0.2);
  border: 1px solid rgba(99, 102, 241, 0.4);
  color: #C7D2FE;
  font-size: 0.75rem;
  font-weight: 700;
  padding: 3px 10px;
  border-radius: var(--radius-full);
}

.badge-step-count {
  font-size: 0.75rem;
  color: var(--text-dim);
}

.step-title {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 2px;
}

.step-subtitle {
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* Coach Bubble */
.coach-bubble-card {
  display: flex;
  gap: 12px;
  background: rgba(30, 41, 59, 0.6);
  border: 1px solid rgba(255, 255, 255, 0.06);
  border-radius: var(--radius-md);
  padding: 12px 14px;
  align-items: flex-start;
}

.coach-avatar {
  font-size: 1.5rem;
  background: rgba(255, 255, 255, 0.06);
  width: 38px;
  height: 38px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.coach-content {
  flex: 1;
}

.coach-label {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 4px;
}

.coach-label span {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--accent-cyan);
}

.btn-audio-mini {
  background: transparent;
  border: none;
  color: var(--primary-light);
  font-size: 0.75rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 3px;
}

.btn-audio-mini:hover {
  text-decoration: underline;
}

.coach-text {
  font-size: 0.88rem;
  color: var(--text-main);
  line-height: 1.45;
}

/* Dialogue Display */
.dialogue-container {
  display: flex;
  flex-direction: column;
  gap: 10px;
  background: rgba(17, 24, 39, 0.7);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 14px;
}

.dialogue-item {
  display: flex;
  flex-direction: column;
  gap: 3px;
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  background: rgba(255, 255, 255, 0.03);
}

.dialogue-speaker {
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--accent-cyan);
}

.dialogue-en {
  font-size: 0.95rem;
  color: var(--text-main);
  font-weight: 500;
}

.dialogue-ko {
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* Prompt Card */
.prompt-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 20px;
  position: relative;
  text-align: center;
  box-shadow: var(--shadow-sm);
}

.prompt-badge-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 12px;
}

.prompt-badge {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--text-dim);
}

.listen-mode-tag {
  background: rgba(6, 182, 212, 0.15);
  border: 1px solid rgba(6, 182, 212, 0.3);
  color: var(--accent-cyan);
  font-size: 0.7rem;
  padding: 2px 8px;
  border-radius: var(--radius-full);
}

.prompt-english-text {
  font-size: 1.35rem;
  font-weight: 700;
  color: #FFFFFF;
  margin-bottom: 8px;
  line-height: 1.4;
  word-break: keep-all;
}

.prompt-english-text.blur-listening {
  filter: blur(8px);
  user-select: none;
  opacity: 0.6;
}

.prompt-korean-hint {
  font-size: 0.92rem;
  color: var(--text-muted);
  margin-bottom: 16px;
}

/* Quick Timer Bar */
.quick-timer-container {
  margin: 12px 0;
  padding: 8px 12px;
  background: rgba(245, 158, 11, 0.1);
  border: 1px solid rgba(245, 158, 11, 0.3);
  border-radius: var(--radius-sm);
}

.timer-label {
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--accent-amber);
  margin-bottom: 4px;
}

.timer-bar {
  width: 100%;
  height: 6px;
  background: rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-full);
  overflow: hidden;
}

.timer-fill {
  width: 100%;
  height: 100%;
  background: var(--accent-amber);
  transition: width 1s linear;
}

/* Audio Controls */
.audio-control-row {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  flex-wrap: wrap;
  margin-top: 14px;
  padding-top: 14px;
  border-top: 1px solid var(--border-subtle);
}

.btn-action-audio {
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid var(--border-subtle);
  color: var(--text-main);
  padding: 8px 14px;
  border-radius: var(--radius-md);
  font-size: 0.85rem;
  font-weight: 500;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 6px;
  transition: all 0.2s ease;
}

.btn-action-audio:hover {
  background: rgba(255, 255, 255, 0.14);
  border-color: var(--primary-light);
}

.btn-action-audio.btn-sub {
  background: transparent;
  border-color: rgba(255, 255, 255, 0.06);
  color: var(--text-muted);
}

.speed-selector {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.8rem;
  color: var(--text-dim);
}

.speed-selector select {
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid var(--border-subtle);
  color: var(--text-main);
  padding: 4px 8px;
  border-radius: var(--radius-sm);
  font-size: 0.8rem;
  outline: none;
}

/* ==========================================================================
   Speaking Section & Big Mic Button
   ========================================================================== */

.speaking-section {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
  margin-top: 8px;
}

.speaking-status-row {
  display: flex;
  align-items: center;
  gap: 8px;
}

.status-indicator {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.recording-timer {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--accent-rose);
  font-variant-numeric: tabular-nums;
}

.mic-button-wrapper {
  position: relative;
  width: 90px;
  height: 90px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.btn-mic-main {
  width: 80px;
  height: 80px;
  border-radius: 50%;
  border: none;
  background: linear-gradient(135deg, #4F46E5 0%, #06B6D4 100%);
  color: #FFFFFF;
  cursor: pointer;
  position: relative;
  z-index: 2;
  box-shadow: 0 4px 20px rgba(79, 70, 229, 0.5);
  transition: all 0.25s ease;
  display: flex;
  align-items: center;
  justify-content: center;
}

.btn-mic-main:hover {
  transform: scale(1.05);
  box-shadow: 0 6px 28px rgba(6, 182, 212, 0.6);
}

.mic-core-icon {
  font-size: 2rem;
}

/* Recording Pulse Animation */
.btn-mic-main.recording {
  background: linear-gradient(135deg, #E11D48 0%, #F43F5E 100%);
  box-shadow: 0 0 24px rgba(244, 63, 94, 0.7);
  animation: pulseRecording 1.4s infinite;
}

.btn-mic-main.recording .mic-wave,
.btn-mic-main.recording .mic-wave-outer {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 100%;
  height: 100%;
  border-radius: 50%;
  border: 2px solid rgba(244, 63, 94, 0.8);
  animation: wavePulse 1.8s infinite ease-out;
  pointer-events: none;
}

.btn-mic-main.recording .mic-wave-outer {
  animation-delay: 0.6s;
}

@keyframes pulseRecording {
  0% { transform: scale(1); }
  50% { transform: scale(1.06); }
  100% { transform: scale(1); }
}

@keyframes wavePulse {
  0% { width: 80px; height: 80px; opacity: 1; }
  100% { width: 140px; height: 140px; opacity: 0; }
}

/* Transcript Card (Editable) */
.transcript-card {
  width: 100%;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 14px 16px;
}

.transcript-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 8px;
}

.transcript-title-group {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--accent-cyan);
}

.helper-text {
  font-size: 0.7rem;
  color: var(--text-dim);
  font-weight: 400;
}

.btn-text-only {
  background: none;
  border: none;
  color: var(--text-dim);
  font-size: 0.75rem;
  cursor: pointer;
}

.btn-text-only:hover {
  color: var(--text-main);
}

.transcript-textarea {
  width: 100%;
  background: rgba(0, 0, 0, 0.3);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  color: var(--text-main);
  padding: 10px 12px;
  font-family: inherit;
  font-size: 0.95rem;
  line-height: 1.45;
  resize: vertical;
  outline: none;
  transition: border-color 0.2s;
}

.transcript-textarea:focus {
  border-color: var(--primary-light);
}

.transcript-actions {
  display: flex;
  justify-content: flex-end;
  margin-top: 10px;
}

.btn-submit-eval {
  background: linear-gradient(135deg, #4F46E5 0%, #3B82F6 100%);
  border: none;
  color: #FFFFFF;
  padding: 10px 18px;
  border-radius: var(--radius-md);
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 8px;
  transition: all 0.2s;
  box-shadow: 0 2px 8px rgba(79, 70, 229, 0.3);
}

.btn-submit-eval:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 14px rgba(79, 70, 229, 0.45);
}

/* ==========================================================================
   Evaluation & AI Feedback Card
   ========================================================================== */

.evaluation-card {
  width: 100%;
  background: linear-gradient(180deg, rgba(30, 41, 59, 0.95) 0%, rgba(15, 23, 42, 0.98) 100%);
  border: 1px solid rgba(99, 102, 241, 0.3);
  border-radius: var(--radius-lg);
  padding: 20px;
  box-shadow: var(--shadow-md);
  animation: slideUp 0.35s cubic-bezier(0.16, 1, 0.3, 1);
}

@keyframes slideUp {
  from { opacity: 0; transform: translateY(12px); }
  to { opacity: 1; transform: translateY(0); }
}

.eval-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--border-subtle);
  margin-bottom: 14px;
}

.eval-status-badge {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 1.05rem;
  font-weight: 700;
}

.eval-status-badge.passed {
  color: #34D399;
}

.eval-status-badge.retry {
  color: #F87171;
}

.eval-score-ring {
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-full);
  padding: 4px 12px;
  font-weight: 800;
  font-size: 1.1rem;
  color: var(--accent-cyan);
}

.eval-score-ring small {
  font-size: 0.75rem;
  font-weight: 400;
  color: var(--text-dim);
  margin-left: 2px;
}

.eval-body {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.eval-row {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.eval-label {
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--text-dim);
  text-transform: uppercase;
}

.eval-value {
  font-size: 0.92rem;
  color: var(--text-main);
  line-height: 1.45;
}

.highlight-box {
  background: rgba(79, 70, 229, 0.12);
  border: 1px solid rgba(99, 102, 241, 0.25);
  border-radius: var(--radius-md);
  padding: 12px 14px;
}

.model-sentence-box {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 10px;
  margin-top: 4px;
}

.model-sentence {
  font-size: 1.02rem;
  font-weight: 600;
  color: #FFFFFF;
}

.btn-listen-model {
  background: rgba(99, 102, 241, 0.25);
  border: 1px solid rgba(99, 102, 241, 0.4);
  color: #C7D2FE;
  padding: 6px 12px;
  border-radius: var(--radius-md);
  font-size: 0.8rem;
  cursor: pointer;
  white-space: nowrap;
  transition: all 0.2s;
}

.btn-listen-model:hover {
  background: var(--primary);
  color: #FFFFFF;
}

.eval-footer-actions {
  display: flex;
  gap: 12px;
  margin-top: 18px;
  padding-top: 16px;
  border-top: 1px solid var(--border-subtle);
}

.btn-eval-secondary {
  flex: 1;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid var(--border-subtle);
  color: var(--text-main);
  padding: 12px;
  border-radius: var(--radius-md);
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  transition: all 0.2s;
}

.btn-eval-secondary:hover {
  background: rgba(255, 255, 255, 0.14);
}

.btn-eval-primary {
  flex: 1.3;
  background: linear-gradient(135deg, #10B981 0%, #059669 100%);
  border: none;
  color: #FFFFFF;
  padding: 12px;
  border-radius: var(--radius-md);
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  transition: all 0.2s;
  box-shadow: 0 4px 14px rgba(16, 185, 129, 0.35);
}

.btn-eval-primary:hover {
  transform: translateY(-1px);
  box-shadow: 0 6px 18px rgba(16, 185, 129, 0.5);
}

/* Lesson Bottom Nav */
.lesson-bottom-nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 12px;
  border-top: 1px solid var(--border-subtle);
}

.btn-nav-prev, .btn-nav-next, .btn-nav-exit {
  background: none;
  border: none;
  color: var(--text-dim);
  font-size: 0.85rem;
  cursor: pointer;
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  transition: color 0.2s;
}

.btn-nav-prev:hover, .btn-nav-next:hover, .btn-nav-exit:hover {
  color: var(--text-main);
  background: rgba(255, 255, 255, 0.05);
}

/* ==========================================================================
   TAB 3: SMART REVIEW (SRS)
   ========================================================================== */

.review-hero {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 20px;
}

.review-hero-text h2 {
  font-size: 1.25rem;
  font-weight: 700;
}

.review-hero-text p {
  font-size: 0.82rem;
  color: var(--text-muted);
}

.review-stats-badge {
  background: rgba(245, 158, 11, 0.15);
  border: 1px solid rgba(245, 158, 11, 0.3);
  color: var(--accent-amber);
  font-size: 0.85rem;
  font-weight: 700;
  padding: 6px 12px;
  border-radius: var(--radius-full);
  white-space: nowrap;
}

.flashcard {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 24px;
  min-height: 240px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  box-shadow: var(--shadow-md);
  margin-bottom: 16px;
  text-align: center;
}

.card-tag {
  font-size: 0.75rem;
  color: var(--accent-cyan);
  font-weight: 600;
  display: block;
  margin-bottom: 14px;
}

.card-prompt {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 10px;
  line-height: 1.45;
}

.card-hint {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 16px;
}

.card-back {
  padding-top: 14px;
  border-top: 1px solid var(--border-subtle);
  margin-top: 14px;
}

.card-english {
  font-size: 1.2rem;
  font-weight: 700;
  color: #38BDF8;
  margin-bottom: 12px;
  line-height: 1.4;
}

.card-bottom-actions {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 12px;
  margin-top: 16px;
}

.btn-secondary-medium {
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid var(--border-subtle);
  color: var(--text-main);
  padding: 8px 16px;
  border-radius: var(--radius-md);
  font-size: 0.85rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s;
}

.btn-secondary-medium:hover {
  background: rgba(255, 255, 255, 0.15);
}

.btn-icon-toggle {
  background: none;
  border: 1px solid var(--border-subtle);
  border-radius: 50%;
  width: 36px;
  height: 36px;
  font-size: 1.1rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent-amber);
}

.srs-decision-row {
  display: flex;
  gap: 12px;
  margin-bottom: 24px;
}

.btn-srs {
  flex: 1;
  padding: 14px;
  border-radius: var(--radius-md);
  border: none;
  color: #FFFFFF;
  cursor: pointer;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  transition: all 0.2s;
}

.btn-srs .srs-label {
  font-size: 0.95rem;
  font-weight: 700;
}

.btn-srs small {
  font-size: 0.72rem;
  opacity: 0.85;
}

.btn-srs-red {
  background: rgba(239, 68, 68, 0.2);
  border: 1px solid rgba(239, 68, 68, 0.4);
  color: #FCA5A5;
}

.btn-srs-red:hover {
  background: rgba(239, 68, 68, 0.35);
}

.btn-srs-green {
  background: rgba(16, 185, 129, 0.2);
  border: 1px solid rgba(16, 185, 129, 0.4);
  color: #6EE7B7;
}

.btn-srs-green:hover {
  background: rgba(16, 185, 129, 0.35);
}

.empty-state {
  text-align: center;
  padding: 40px 20px;
  background: var(--bg-card);
  border: 1px dashed var(--border-subtle);
  border-radius: var(--radius-lg);
  margin-bottom: 24px;
}

.empty-icon {
  font-size: 2.5rem;
  margin-bottom: 12px;
}

.empty-state h3 {
  font-size: 1.1rem;
  margin-bottom: 6px;
}

.empty-state p {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 16px;
}

/* Stored Review Table */
.review-table-wrapper {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.review-item-row {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  padding: 10px 14px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.88rem;
}

.review-item-left {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.review-item-en {
  font-weight: 600;
  color: var(--text-main);
}

.review-item-ko {
  font-size: 0.78rem;
  color: var(--text-muted);
}

.review-item-right {
  display: flex;
  align-items: center;
  gap: 8px;
}

/* ==========================================================================
   TAB 4: DASHBOARD & STATS
   ========================================================================== */

.dashboard-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
  margin-bottom: 24px;
}

.stat-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 16px;
  display: flex;
  align-items: center;
  gap: 12px;
}

.stat-icon {
  font-size: 1.6rem;
  background: rgba(255, 255, 255, 0.05);
  width: 44px;
  height: 44px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.stat-info {
  display: flex;
  flex-direction: column;
}

.stat-value {
  font-size: 1.4rem;
  font-weight: 800;
  letter-spacing: -0.5px;
}

.stat-label {
  font-size: 0.75rem;
  color: var(--text-muted);
}

.attempts-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-top: 10px;
}

.attempt-item-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  padding: 10px 14px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.85rem;
}

.attempt-item-left {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.attempt-prompt {
  color: var(--text-muted);
  font-size: 0.78rem;
}

.attempt-spoken {
  font-weight: 600;
  color: var(--text-main);
}

.attempt-badge-pass {
  background: rgba(16, 185, 129, 0.2);
  color: #6EE7B7;
  padding: 2px 8px;
  border-radius: var(--radius-full);
  font-size: 0.75rem;
  font-weight: 600;
}

.attempt-badge-fail {
  background: rgba(239, 68, 68, 0.2);
  color: #FCA5A5;
  padding: 2px 8px;
  border-radius: var(--radius-full);
  font-size: 0.75rem;
  font-weight: 600;
}

/* ==========================================================================
   TAB 5: SETTINGS
   ========================================================================== */

.settings-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 18px;
  margin-top: 14px;
}

.setting-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--border-subtle);
}

.setting-item:last-of-type {
  border-bottom: none;
}

.setting-text label {
  font-size: 0.95rem;
  font-weight: 600;
  display: block;
}

.setting-text small {
  font-size: 0.78rem;
  color: var(--text-muted);
}

.input-text, .select-input {
  background: rgba(0, 0, 0, 0.35);
  border: 1px solid var(--border-subtle);
  color: var(--text-main);
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  outline: none;
  font-family: inherit;
}

.input-text:focus, .select-input:focus {
  border-color: var(--primary-light);
}

/* Toggle Switch */
.toggle-switch {
  position: relative;
  display: inline-block;
  width: 48px;
  height: 26px;
  flex-shrink: 0;
}

.toggle-switch input {
  opacity: 0;
  width: 0;
  height: 0;
}

.toggle-slider {
  position: absolute;
  cursor: pointer;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(255, 255, 255, 0.15);
  transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  border-radius: var(--radius-full);
}

.toggle-slider:before {
  position: absolute;
  content: "";
  height: 20px;
  width: 20px;
  left: 3px;
  bottom: 3px;
  background-color: white;
  transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  border-radius: 50%;
}

input:checked + .toggle-slider {
  background-color: var(--primary-light);
}

input:checked + .toggle-slider:before {
  transform: translateX(22px);
}

.settings-actions {
  display: flex;
  justify-content: flex-end;
  margin-top: 10px;
}

/* ==========================================================================
   Bottom Navigation Bar
   ========================================================================== */

.bottom-nav {
  position: fixed;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 100%;
  max-width: 680px;
  height: var(--bottom-nav-height);
  background: rgba(11, 15, 25, 0.92);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-top: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
  justify-content: space-around;
  padding: 6px 10px;
  z-index: 100;
}

.nav-tab {
  background: none;
  border: none;
  color: var(--text-dim);
  cursor: pointer;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 4px;
  padding: 6px 12px;
  border-radius: var(--radius-md);
  transition: all 0.2s ease;
  flex: 1;
}

.nav-tab .nav-icon {
  font-size: 1.25rem;
  transition: transform 0.2s ease;
}

.nav-tab .nav-label {
  font-size: 0.7rem;
  font-weight: 500;
}

.nav-tab.active {
  color: var(--accent-cyan);
}

.nav-tab.active .nav-icon {
  transform: scale(1.15);
}

.nav-tab:hover {
  color: var(--text-main);
}

/* 영단장 탭: 헤더와 하단 내비 사이를 채우는 iframe */
#tab-vocab { margin: -16px -18px; }
.vocab-frame {
  display: block;
  width: 100%;
  height: calc(100vh - 64px - var(--bottom-nav-height));
  border: 0;
  background: #FFF5F7;
}